Hidden EDC fees: the complete list, and what to ask

EDC is usually sold per deal. The vendor scopes your protocol, then prices a build, a licence, sites, users and modules, often in separate documents: a master services agreement, a statement of work and a rate card for changes. The headline number a buyer remembers is the licence, while the rate card for changes is the part that decides what the study ends up costing.

There is nothing unusual about each fee on its own. Building a database takes labour, and hosting has a cost. The problem is that the fees that scale with your decisions, such as adding a site, amending a form or extending the study, are the ones least likely to appear in the first quote. Our EDC software pricing guide explains the market tiers; this page lists the lines to check inside them.

Protocols change. Tufts CSDD found that 57% of protocols have at least one substantial amendment, with a median direct cost of $141,000 per amendment in Phase 2 and $535,000 in Phase 3 across all activities, not just EDC. The EDC share of that is the part you can influence, because it depends on who is allowed to edit the database.

In a vendor-built EDC, any amendment touching forms, visits or edit checks becomes a change order: a specification, programming, testing and redeployment, often taking several weeks, billed on top of the build. Enrolment may pause while you wait. Ask the vendor for the rate and the turnaround before you sign, and ask what happens when two amendments overlap.

With a self-serve builder, the study team updates forms and visits itself and there is no change order. Capture works this way: approved forms lock for live use, edits follow a draft-to-approved lifecycle, and every change is recorded in the field-level audit trail. Read protocol amendments without change orders for how that works in practice.

A study with 100 participants at one site can become a study with 100 participants at six sites after a protocol update or a recruitment problem. If each site carries an activation fee and each coordinator a seat, the bill grows with a decision that had nothing to do with data volume.

Seats raise a second problem. Monitors, data managers, statisticians and auditors all need access at some point. If every named user is a licence, teams quietly share logins or limit review, and both weaken the audit trail. Role-based access with no per-seat charge removes that incentive. Capture does not charge per seat or per site; see clinical trial software without setup fees for the broader pattern.

Modules are the third lever. When ePRO, eConsent and randomization are separate products, each adds a licence, a build and an integration, and the reconciliation between them is your team's job. Counting those lines is the fastest way to compare a modular suite with a single platform.

Paste the twelve categories above into your request for proposal and require each vendor to respond to every line, with not applicable as a permitted answer. Vendors that bundle lines will say so, and vendors that charge separately will have to show it. Our EDC RFP template has the surrounding questions on validation, security and support.

Then price your own study in the EDC cost calculator, which models change orders, per-site and per-participant charges, modules and close-out line by line. Use it to sense-check any quote. If a vendor's total is far below the model, find the missing line before you celebrate.